I quite like the what's been downloaded list. its a different version of favourites. I also refer to my commented pages - I comment on images I like instantly. so that ways I can keep track of what i like too :)

As our site is pretty new, we are still adding some basic features. I think bookmarks in some form is a something which should be pretty high on our list. I'm working on adding more search-options right now. Because people think that is most important right now. After that bookmarks is probably a very good idea.

yes, search options I think is the most important one, which directly impacts the users first. I wish the authors/ artists/ photographers included more keywords. I think the admin could make an important change - have the right to add more keywords if needed ? it would be very useful. because I see that there are many images with very few keywords.